I asked the all knowledgeable Mr Google to see if he knew. It is a 20th Century style of treasure hunt. Wikipedia says:
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Geocaching is an outdoor treasure-hunting game in which the participants use a Global Positioning System (GPS) receiver or other navigational techniques to hide and seek containers (called "geocaches" or "caches") anywhere in the world. A typical cache is a small waterproof container containing a logbook and "treasure", usually toys or trinkets of little monetary value.
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